Question

When running a Java class through Ant, I was having a lot of trouble getting Log4J output, even though the log4.properties was on the classpath. Documenting it here in case anyone else has the same problem.

E.g.

<java classname="Hello" fork="true">      
    <classpath> 
    <fileset dir="${lib.dir}">
        <include name="**/*.jar"/>
    </fileset>     
    </classpath>
</java>

Answer 1

This can be solved using something like the following:

<property name="log4j" value="file:///${basedir}/log4j.properties"/>
...
<java classname="Hello" fork="true">   
    <sysproperty key="log4j.configuration" value="${log4j}"/>
    <classpath> 
        <fileset dir="${lib.dir}">
            <include name="**/*.jar"/>
        </fileset>     
    </classpath>
</java>